Blasting



Jan. 1, 1924 v 1,479,070

W. E. HARRIS BLASTING Filed July 18. 1922 iffarn 94 Patented Jan. l,1924.

UNITED STATES WILLIAM EDWARD HARRIS, OF LUIPAARDSVLEI, TRANSVAAL, SOUTHAFRICA.

BLASTIN G.

Application filed July 18, 1922. Serial No. 575,791.

To all whom it may concern:

Be it known that I, WILLIAM EDWARD HARRIS, subject of the King of GreatBritain, residing at Luipaardsvlei, Transvaal Province of the Union ofSouth Africa, have invented certain new and useful Improvements in andRelating to Blasting, of which the following is a specification.

This invention relates to blasting and its object is to produce a devicewhich will not allow the tamping to blow out and will enable a perfectexplosion to take place.

According to this invention a check is provided for insertion after theusual tamping which consists of two portions each substantially theshape of a cylinder a portion of which has been removed by a planepassing from one end of a diameter at or near the base to the oppositeend of the corresponding diameter of the top, thus forming a wedge witha rounded back, any cross section of the wedge being substantially Dshaped. The face thus formed has in it a groove running centrally downit and graduated in depth from the one end to the other so that when thetwo portions are placed together face to face the grooves on eachportion form together a channel in which the fuse fits, the whole devicebeing substantially cylindrical.

The invention is illustrated in the accompanying drawings in which Fig.I shows the two portions of the check separated and in perspective.

Fig. II shows a perspective view of the check with the fuse in position.

Referring to Fig. I, 1 is the groove in which the fuse fits and 2 is theinclined face of the wedge which is formed with a rounded back 3.Serrations 4 may beprovided on one of the portions of the check in orderto assist in retaining it in position against the force of the explosionbut such serrations are not essential.

Fig. II shows the two portions of the check with the fuse 5 in position.

When the two portions are placed together in the manner indicated in ahole made by a drill the top of the check 6 is tapped home thusexpanding the check as a whole and forcing it into intimate contact withthe wall of the cavity.

When the explosion takes place the force applied to the tamping end 7 ofthe check tends to expand it and hold it in position instead of forcingit out.

The checks are preferably made of glass, pottery, hardwood, fibre orsome such material which will not do any damage should it be carried tothe reduction plant. The use of this check ensures a perfect explosion,more ground can be taken and there is no tendency of the displaced rockto spread and do damage in the working place.

I claim:

1. A cylindrical check comprising a pair of complementalreversely-arranged wedge portions, each portion having an inclined faceportion extending from the end of one side of said portion to near theother end of the side directly opposite, and each of said wedge portionshaving a groove therein extending along the entire inclined faceportion, and along the outside of said wedge portion thereby formingcontinuous pas-- sage for the fuse.

2. A check for insertion. after the usual tamping consisting of twoportions each sub stantia-lly the shape of a cylinder :1 portion ofwhich has been removed by a plane passing from one end of a diameter ator near the base to the opposite end of the corre sponding diameter ofthe top, the face thus formed having in it a groove to accommodate thefuse. I

3. A check for insertion after the usual tamping consisting of twoportions each sub stantially the shape of a cylinder a portion of whichhas been removed by a plane passing from one end of a diameter at ornear the base to the opposite end of the corresponding diameter of thetop, the face thus formed having in it a groove running cen trally downit and graduated in depth from one end to the other so that when the twoportions are placed together face to face the grooves on each portionform a channel in which the fuse fits.

A check comprising two reversely-arranged complement-a1 members havingtheir contacting surfaces disposed at an angle to the axis of the checkwhereby said surface; will be caused to exert a wedging action againsteach other when pressure is imposed against either end of the check;said surfaces being provided with grooves to form a continuous passagethrough the check for the fuse.

In testimony whereof I afix my signature.

WILLIAid EDWARD HARRIS.

